/// <summary>
/// Initializes a new instance of the <see cref="TopicSender"/> class,
/// automatically creating the given topic if it does not exist.
/// </summary>
protected TopicSender(ServiceBusSettings settings, string topic, RetryStrategy retryStrategy)
{
this.settings = settings;
this.topic = topic;
// TODO: This could be injected.
this.retryPolicy = new RetryPolicy<ServiceBusTransientErrorDetectionStrategy>(retryStrategy);
this.retryPolicy.Retrying +=
(s, e) =>
{
var handler = this.Retrying;
if (handler != null)
{
handler(this, EventArgs.Empty);
}
Trace.TraceWarning("An error occurred in attempt number {1} to send a message: {0}", e.LastException.Message, e.CurrentRetryCount);
};
var factory = settings.GetMessagingFactory();
this.topicClient = factory.CreateTopicClient(this.topic);
}
/// <summary>
/// Initializes a new instance of the <see cref="SubscriptionReceiver"/> class,
/// automatically creating the topic and subscription if they don't exist.
/// </summary>
protected SubscriptionReceiver(ServiceBusSettings settings, string topic, string subscription, bool processInParallel, ISubscriptionReceiverInstrumentation instrumentation, RetryStrategy backgroundRetryStrategy)
{
this.settings = settings;
this.topic = topic;
this.subscription = subscription;
this.processInParallel = processInParallel;
this.instrumentation = instrumentation;
var messagingFactory = settings.GetMessagingFactory();
this.client = messagingFactory.CreateSubscriptionClient(topic, subscription);
if (this.processInParallel)
{
this.client.PrefetchCount = 18;
}
else
{
this.client.PrefetchCount = 14;
}
this.dynamicThrottling =
new DynamicThrottling(
maxDegreeOfParallelism: 100,
minDegreeOfParallelism: 50,
penaltyAmount: 3,
workFailedPenaltyAmount: 5,
workCompletedParallelismGain: 1,
intervalForRestoringDegreeOfParallelism: 8000);
this.receiveRetryPolicy = new RetryPolicy<ServiceBusTransientErrorDetectionStrategy>(backgroundRetryStrategy);
this.receiveRetryPolicy.Retrying += (s, e) =>
{
this.dynamicThrottling.Penalize();
Trace.TraceWarning(
"An error occurred in attempt number {1} to receive a message from subscription {2}: {0}",
e.LastException.Message,
e.CurrentRetryCount,
this.subscription);
};
}